罗源湾夏季鱼卵和仔稚鱼种类组成与数量分布

分析研究了2009年7月福建罗源湾鱼卵、仔稚鱼的种类组成及数量分布。共鉴定19种鱼类的鱼卵和仔稚鱼,隶属于13科。其中,鱼卵10种、仔稚鱼14种。夏季,罗源湾水平拖网鱼卵和仔稚鱼平均密度分别为1.80 ind/m3和0.54 ind/m3;垂直拖网鱼卵和仔稚鱼平均密度分别为4.11 ind/m3和2.63 ind/m3。鱼卵、仔稚鱼以鳀科数量最多,优势种类为中颌棱鳀(Thrissa mystax)和康氏小公鱼(Stolephoruscommersonli)。与历史资料相比,不但种类数减少,且优势种由多科鱼类并存向鳀科鱼类为主转变。夏季鱼卵、仔稚鱼主要分布在罗源湾中北部海域及湾口附近。

Species composition and quantity distribution of ichthyoplankton in Luoyuan bay in summer

The species composition and quantity distribution of fish eggs, larvae and juveniles in Luoyuan bay in summer 2009 were studied. It was found that 19 eggs, larvae and juveniles were identified during this survey, belonging to 13 families, among which 10 eggs and 14 larvae and juveniles were included. For fish eggs, larvae and juveniles in Luoyuan bay in summer, the mean densities were 1.80 ind/m3 and 0. 54 ind/m3 by horizontal trawling, and 4. 11 ind/m3 and 2. 63 ind/m3 by vertical trawling. Species in Engraulidae family were the most abundant, and the dominant species were Thrissa mystax and Stolephorus commersonli. Compared with the past, the species numbers of iehthyoplankton were decreasing, and the dominant species varied from several coexisted family fish to dominated species in Engraulidae family. The distribution area of high abundance region for iehthyoplankton in summer appeared in the central and northern part and bay mouth of Luoyuan bay.